nodejs 官网代码问题

下面代码不能运行。

const http = require('http'); const net = require('net'); const url = require('url'); // 创建一个 HTTP 代理服务器 const proxy = http.createServer((req, res) => { res.writeHead(200, { 'Content-Type': 'text/plain' }); res.end('okay'); }); proxy.on('connect', (req, cltSocket, head) => { // 连接到一个服务器 const srvUrl = url.parse(`http://${req.url}`); const srvSocket = net.connect(srvUrl.port, srvUrl.hostname, () => { cltSocket.write('HTTP/1.1 200 Connection Established\r\n' + 'Proxy-agent: Node.js-Proxy\r\n' + '\r\n'); srvSocket.write(head); srvSocket.pipe(cltSocket); cltSocket.pipe(srvSocket); }); }); // 代理服务器正在运行 proxy.listen(1337, '127.0.0.1', () => { // 发送一个请求到代理服务器 const optiOns= { port: 1337, hostname: '127.0.0.1', method: 'CONNECT', path: 'www.google.com:80' }; const req = http.request(options); req.end(); req.on('connect', (res, socket, head) => { console.log('已连接！'); // 通过代理服务器发送一个请求 socket.write('GET / HTTP/1.1\r\n' + 'Host: www.google.com:80\r\n' + 'Connection: close\r\n' + '\r\n'); socket.on('data', (chunk) => { console.log(chunk.toString()); }); socket.on('end', () => { proxy.close(); }); }); });